dom/canvas/test/test_offscreencanvas_neuter.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4 <title>OffscreenCanvas: Test neutering</title>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 </head>
   8 <body>
   9 <canvas id="c" width="64" height="64"></canvas>
  10 <script>
  11
  12 SimpleTest.waitForExplicitFinish();
  13
  14 function runTest() {
  15
  16   var htmlCanvas = document.getElementById("c");
  17   var worker = new Worker("offscreencanvas_neuter.js");
  18
  19   ok(htmlCanvas, "Should have HTML canvas element");
  20   ok(worker, "Web worker successfully created");
  21
  22   ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");
  23
  24   var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
  25   ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");
  26
  27   /* check html canvas is neuterd */
  28   is(htmlCanvas.width, 64, "HTML canvas has correct width");
  29   SimpleTest.doesThrow(
  30     function() { htmlCanvas.width = 128; },
  31     "Can't change html canvas' width after transferControlToOffscreen");
  32
  33   SimpleTest.doesThrow(
  34     function() { htmlCanvas.height = 128; },
  35     "Can't change html canvas' height after transferControlToOffscreen");
  36
  37   ok(!htmlCanvas.getContext("2d"), "Can't getContext after transferControlToOffscreen");
  38   ok(!htmlCanvas.getContext("webgl"), "Can't getContext after transferControlToOffscreen");
  39   ok(!htmlCanvas.getContext("webgl2"), "Can't getContext after transferControlToOffscreen");
  40
  41   worker.postMessage(offscreenCanvas, [offscreenCanvas]);
  42
  43   /* check parent offscreencanvas is neutered after being transfered */
  44   SimpleTest.doesThrow(
  45     function() { offscreenCanvas.width = 128; },
  46     "Can't change transfered worker canvas width");
  47
  48   SimpleTest.doesThrow(
  49     function() { offscreenCanvas.height = 128; },
  50     "Can't change transfered worker canvas height");
  51
  52   SimpleTest.doesThrow(
  53     function() { offscreenCanvas.getContext("2d") },
  54     "Can't getContext on transfered worker canvas");
  55
  56   SimpleTest.doesThrow(
  57     function() { offscreenCanvas.getContext("webgl") },
  58     "Can't getContext on transfered worker canvas");
  59
  60   SimpleTest.doesThrow(
  61     function() { offscreenCanvas.getContext("webgl2") },
  62     "Can't getContext on transfered worker canvas");
  63
  64   // Transfer a neutered offscreencanvas should be ok.
  65   worker.postMessage(offscreenCanvas, [offscreenCanvas]);
  66
  67   worker.terminate();
  68   SimpleTest.finish();
  69 }
  70
  71 SpecialPowers.pushPrefEnv({'set': [
  72   ['webgl.force-enabled', true],
  73 ]}, runTest);
  74
  75 </script>
  76 </body>
  77 </html>